A Loft or Mezzanine in a Type-70 Two-Storey Home: How to Tuck In Extra Space

Plenty of type-70 owners in the North Bekasi area only realise their space needs have changed after two or three years living there. Two bedrooms felt roomy at first, then in came a work desk, a pile of seasonal things, and the wish for a play corner for the kids. The way out doesn't always mean spreading sideways or moving house. Often the wasted room is right above your head, floating between the ceiling and the roof.

This vertical space is the one people rarely look at. Studies on dense urban housing keep pointing to the same thing: land keeps getting more expensive, so the sensible direction to grow is up, not out. At the scale of a single home, that principle plays out through the loft and the mezzanine.

Loft and Mezzanine, What's the Difference

A mezzanine is an intermediate floor, a sort of half-level that rides at the height of a room without covering the whole plan below it. A loft leans more toward turning the space under a roof or a high-ceilinged area into something functional. Both add usable area vertically, and in a two-storey type-70 there are three spots that usually make the most sense.

• Above the living-room void. Many two-storey homes are given a void on purpose, an empty double-height space above the living room, to feel airier. Part of that void can be closed off into a mezzanine.
• Above the rear service zone. Areas like the kitchen or laundry sometimes leave headroom up to the roof frame, and that leftover height is what you can use.
• Under a sloped roof. If the pitch and the height of the roof frame are enough, this area suits sitting or storage.

How Many Metres Is Realistic

Here's the part that needs honesty. With a 4.5 m x 10.5 m footprint like the Emerald 70 House, the gain from a mezzanine or loft usually lands in the range of 4 to 8 square metres, depending on which spot you use and how tall the room below is. Don't picture a whole new floor. This is a small area that fits one single function, and that's exactly where its value sits: room that used to sit empty turns into room you use.

The Ceiling Height You Need

A loft and a mezzanine are only comfortable if the original room is tall enough to split in two. As a rough guide, architects usually suggest the space under a mezzanine keeps a clear height of at least around 2.2 metres so it doesn't feel cramped, while the area above needs about 1.6 to 2 metres depending on its use. For a loft used only for sitting, reading, or storage, a lower height is still fine. So a void spot, or a room whose ceiling reaches the roof frame, becomes the best candidate, because that's where the total height most allows a split in two.

Structure, the Part You Can't Ignore

Adding a floor means adding load. There's dead load from the flooring material plus its frame, and live load from people and things on top of it. All of it has to travel down to the beams, the columns, and finally the foundation. So a loft or mezzanine plan can't start from "just weld the frame onto the existing columns". The home's original columns and beams have a set capacity, and adding load beyond the calculation is a risk.

This is where the foundation matters too. The Emerald 70 House uses a Bor Pile foundation, a deep foundation that channels load into deeper, denser soil layers. Compared with an ordinary shallow foundation, this type has a better reserve of bearing capacity for added load like a mezzanine. But that doesn't mean you can add freely. The calculation still has to be checked by a structural engineer or the developer first, factoring in the flooring material you choose (a light-steel frame with a light deck is clearly lighter than a concrete slab).

The PBG and Permit Question

Since Government Regulation No. 16 of 2021, building permits use the Building Approval (PBG) scheme, which replaced the old IMB. If the loft you build is light, kept inside the room, and changes neither the structure nor the official building area, it generally counts as a minor change. But if the addition is significant enough to add floor area or touch the main structure, the rules suggest checking with the local government or the manager first. Each region's requirements can differ, so confirm with the authorities before you start.

The Cost Range

Cost depends heavily on material and size. The most economical model uses a light-steel or light-profile-steel frame with a plywood or GRC deck, plus a railing and a stair. The heavier, more permanent model uses a concrete slab, and its cost climbs because it needs formwork, rebar, and casting. As a rough estimate, small-scale mezzanine work often lands in the tens-of-millions-of-rupiah range for the light-frame version, and can run higher for the concrete one. These numbers shift easily with material prices and labour rates, so treat them as a starting point for a conversation, not a fixed figure.

What It's Best Used For

Because the area is limited, a loft and a mezzanine shine most when given one clear function. A few common ones: a work nook or WFH space set apart from the bustle below, tidy storage for seasonal items, a small child's room or play area, even a mini library or hobby space. To arrange what goes in it without feeling cramped, the ideas in our guide to minimalist two-storey interior design are a good starting point. If the spot you're eyeing sits near the rear, our reference on kitchen design for a 70m two-storey home also helps you plan the flow of the room below.

The Sides People Often Forget

A few things rarely get thought through early. First, heat. A mezzanine near the roof tends to become the hottest part of the home because hot air rises. Without cross-ventilation, an exhaust, or enough roof insulation, this space can turn stuffy under Bekasi's blazing midday. Second, air circulation and acoustics, especially if the mezzanine opens onto the void, where sound from below travels up easily. We dig into this heat and void-acoustics angle in our acoustic audit for two-storey cluster homes in Bekasi.

Third, access. A loft is often reached by a steep or folding stair that saves space, but it's less friendly for toddlers or the elderly. If the household has older relatives or small children, a fixed stair with a proper handrail becomes an important consideration, even if it eats a little extra room.

The room above your head often ends up the cheapest bedroom you'll ever add to a house, as long as the structure can carry it. In a home like the Emerald 70 on Jl. Raya Perjuangan, North Bekasi, with its Bor Pile foundation, that headroom is worth talking through first, whether before you buy or before you start renovating. Measure first, work out the load, check the permit, then design. That order is what makes the added space last, not merely fit.

Related reading on the Kingspoint Blog

• The Void in Two-Storey Cluster Homes in Bekasi: Airflow, Heat, Acoustics & Cost 2026
• Minimalist Two-Storey Interior Design
• Kitchen Design for a 70m Two-Storey Home